peter's square was packed this morning for pope benedict's final public audience. benedict steps down tomorrow. >> the pope acknowledged difficult times during his papacy but told his people he has great trust in the future of the church. allen pizzey is in st. peter's scare. allen, good morning. >> reporter: good morning. there are fierce concerns about whether or not the monostic life benedict is about to fade into will keep him from having influence on the next papacy. that's for tomorrow. today he was center stage. benedict made a stately arrival for his last general audience aboard a pope mobile perhaps taking advantage of the last time he will have use of one of the specially made vehicle. the crowd of st. ter's square was half the 200,000 the vatican predicted and catered for but the welcome was warm. the pope thanked the crowd as he put it "from the bottom of my heart," and told them he was fully aware of the seriousness and novelty of his decision to resign. cardinals were gathering to choose benedict's successor held places of honor and seemed moved by th